This circuit is from a 1990s publication by William Sheets. The circuit consists of a stage whose gain is adjusted according to the signal intensity.
This circuit was obtained in an American publication in 1978. It generates noise in the audio...
This approach alarm circuit was found in the September 1970 Radio Electronics issue. The 1 mH coil...
We found this motor control circuit that uses only transistors in a 2003 documentation. The H...